In a bowl, combine the flour, sugar, baking powder and salt. Cut in butter until mixture resembles coarse crumbs. Add egg and buttermilk; mix just until dry ingredients are moistened. Fold in berries.
Fill greased or paper-lined muffin cups two-thirds full. Bake at 400° for 25 minutes or until browned.
Editor's Note: Frozen berries may be used if thawed and well drained.